IMac only boots in to Windows

Hi
My feonca got a copy of windows today and wanted me to install it for her. I created the partition using bootcamp setup the inserted the windows cd and rebooted. Competed the installation. Then I inserted the Leopard cd and ran the setup for the drivers. Some of the drivers would not install. It was then that I discovered the copy of windows is 64-bit and I cant get leopard back. The iMac only boots in to windows. What can I do to fix this.
thanks Dan

Holding down the option (or alt)-key during booting--as soon as you hear the apple chime--doesn't work?

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